Door lock



April 7, 1953 c. L.IHEIZMANN DOOR LOCK Filed July El. 1950 INVENTOR. CHARLEs L.HIZIZMANM Patented Apr. 7, 1953 noon LOCK Charles L. Heizmann, Ocean City, N. J assignor to Earle Hardware Manufacturing Company, Reading, Pa., a. corporation of Pennsylvania Application July 21, 1950, Serial No. 175,113

3 Claims. (Cl. 70-146) This invention relates to locks; more particularly, door locks which are especially useful for outside doors wherein it is desirable to lock the door from the inside or outside.

An object of the present invention is to provide an improved lock having simple parts held in assembled relationship and which lock is inexpensive to manufacture and easy to assemble or install, also which is relatively foolproof or tamperproof.

In its broadest aspects, the outside door lock embodying the present invention comprises essentially three parts; namely, the latch mechanism and the outer and inner knobs having integral tubular spindles, which spindles may be simply and easily interlocked with the latch mechanism after the respective three parts are entered into intersecting holes or mortises provided in the door at right angular relationship. The respective parts may be made from dies and are constructed of sheet steel. They are devoid of small screws or other easily lost parts. The

inner knob may be provided with a dead latch or dogging member for restraining the outer knob against rotation so as to lock the door from the inside of a room, whereas the outer knob is provided with a cylinder lock which enables locking or unlocking of the door from the outside bymeans of a key.

The above and other objects of the invention will become apparent from a study of the following specification taken with the accompanying drawing wherein:

Fig. 1 is a horizontal, longitudinal section showing a lock embodying the principles of the present invention and installed in a door;

Fig.'2 is a side view of the two knobs and integral tubular spindles, one of which knobs is shown broken away;

Fig. 3 is a vertical section taken along line III--III of Fig. 1 showing the latch bolt in the normal or outwardly biased position relative the strip I8 in the interlocked position as shown in --Fig.-7*,and

Fig. 9 is a cross-sectional view similar to Fig. 8, but showing the extremities of strip 18 in the position when inserted through the latch bolt hole.

Referring more particularly to Fig. 1, numeral l denotes a portion of a door having a mortise or round hole 2 drilled inwardly from the edge thereof and another round hole 211 at right angles thereto extending through the thickness or width of the door. A tubular spindle 4 having an integral outer knob 5 is provided on the outer face of the door, whereas a tubular spindle 6 having an integral inner knob '1 extends from the inner face of the door. Suitable escutcheons 8 and 9 are provided on the outer and inner faces of the of the door by screws extending through apertures thereof in a well known manner.

As will appear more clearly in Fig. 2, the respective tubular spindles 4 and 6 are provided with circumferentially extending slots 28a and 28b which encompass only a substantially semicircular portion of the tubular spindles 4 and 6, respectively. The inner ends of the respective spindles 4 and 6 are provided with projections or lugs I90, and I912 of arcuate shape which serve as rollback members for operating the latch bolt.

The manner in which the projections or rollback members from the respective spindles operate the latch bolt will become more readily apparent from an inspection of Fig. 3. The latch bolt I4 is normally biased in the position shown in Fig. 3, that is, outwardly of the face plate [6 by means of a compression spring ['5 mounted within a cylindrical housing l1. One end of the spring I5 is seated on an inwardly bent portion Ila of the housing, whereas the other end is seated on the rear surface of the latch bolt l4. Detachably secured to the'latch bolt I4 is a retractor element or strip I8 whose outer extremities lBb may be sprung together as shown in Fig. 9 and inserted through the hole 33 of a latch bolt in angular plate 32 and then turned to the position shown in Figs. 7 and 8, spreading apart by its springiness. Strip I8 is in the form of a loop, the most inward projecting portion having a somewhat saddleshaped reentrant portion [8a along the inner surface of which is slidably seated the respective projections or rollback members 19a and I9b. Thus if either the inner knob or outer knob is turned so as to effect rotation of its associated rollback member, the rollback member will move retractor element i8 as shown more clearly in Fig. 5. As will be apparent from this figure,

peripheryof the sleeve 3.

rollback member 19a has been partially rotated so that one edge thereof pushes against one surface of the bent end portion of the arcuate shaped portion 18a, thereby retractor strip I8 as well as the latch bolt [4 is retracted against the action of the compression spring l5. If the spindle were rotated in the opposite direction instead, the rollback member Ida would cause-apsimilarj retracting movement of the-latch bolt I l-by engagement of the other reversely bent end of portion lBa.

A dead latch arrangement or dogging mechanism may be provided within the spindle of the inner knob I as shown in Fig; 1. Knob"? is pro vided with an inner tubular: or sleeve portion 6' through which may be extended'a plate 28 having a pushbutton 2i rigidly secured to. one end thereof. Figs. 1 and 6, the dead latch or dogging'assembly is mounted inside a sleeve or tube 3 having a cut .out portion or slot extending. centrallythereof throughout a major portion of its periphery. .Iwo smaller slots 3a and 3bv arealso provided which extend through a small portion of the Slots 3a and3b are adapted to register with slots 28a and 23b of the respective tubular spindles.

As will appear more clearly in Fig. 3, there is provided a; U-shaped support element 2'5 whose extremities are adapted tobe extended through and welded, hammered, or otherwise, integrally fastened to sleeve 3 and which serves as a yoke or support for plate 29; allowing sliding movement of the plate relative the sleeve. Spring clips 21 are rigidly secured to opposite sides of .plate 29- in a manner so that their free divergent ends are adapted to be spread apart when plate 2d ispushed inwardly by the pushbutton 2i sufilciently so that the free ends come-in contact with and ride over the U-shaped element 28.. The purpose of the spring clips 2? isto provide friction; and. restrain plate 2d from accidental relative movement with respect to sleeve 3 which might be caused by slamming of the door and the like. As will be seen in Fig. l, the other extremity of plate 26 has a shoulder portion 23 adapted to enter longitudinally extending slot 23 vofspindle -i so as to restrain the outer knob against rotation or, as it is sometimes referred to, effect dogging? of the outer knob. Thus when a person. inside the house has depressed pushbutton 2! so as to insert shoulder portion 23 in slot 29, it willnot be possible to open the door from the outside except by use of a key.

In order to-unlockthe door, itis necessary to insert a key in the key slot in the front faceof cylindrical lock-Hi. r astened to the rear of the cylindrical lock by a screw or other fastening means is an element l2 having a male member iZa fitted into a slot at the rear of cylinder iii. Element 1 2 has a second male member I 2b on its other faceadapted to be fitted into a corresponding female member formed in the rear face of a cylindrical. element i l which has a wedge-shaped end. A key H a or other suitable fastening means will secure the male and female members together as a unit. The wedge-shaped element H is thus rigidly secured to the cylindrical lock iii and rotatable therewith about its axis and its wedge faces are engageable with corresponding faces. formed in a slidably mounted cylindrical element is. Extending longitudinally of element i3. is a. key Ida adapted to. .fit in, a longitudinal slot spindle 4. so as, to, restrain- .element !.3

a ainst .mtation.

As will be apparent from a study of' As will appear more clearly in Fig. 1, when the key is rotated a quarter of a turn from the locked to the unlocked position, rotation of the cylinder lock Ill together with element ll will cause a camming action of the cam faces of elements II and [3 which, in turn, will cause longitudinal movement of element 13 towards the right as viewed inFig." '1 until the rear-or right; hand face of element l3 abuts against element 22v integrally formed on the end portion of locking plate 20.

' As element 22 is pushed to the right, it will reenabling the door-to be opened by turning of the outsideknob 51 When the rear face of element i3 is inthe unlocked position, as described above, it is not possible to push pushbutton 2| to the left, because of the obstruction presented by element [3 unless the key 'is turned back a quarter of. a..turn tov theloclred position so .as-tomake itpossibleto pusher retract element 1.3 to the left, that is, to tlfle position as shown inf-jg. 1. When in such position, by depressingpllshbutton fiishoulder portion 23. is insertable through slot 29. so as to lockspindle 4 and restrain. it. against mtatiomthereby locking the door from the inside andpermitting unlocking only by rotation of the .key in the cylindrical look as described, herein;-

above.

The various parts of the lock may be'assembled in the. following manner: after roundholes or mortises 2 and 2a are drilled through theedge and side faces of the door, the respective spindles land 6 areprojected through hole 2a after sleeve 3 and the doggin mechanism mounted therein has been inserted through the sleeve portion 6 of the inner knob 7. Thus the tube or sleeve 3 is telescopically fitted about spindles land 6. Care must be exercised at this point to avoid pro- .iecting the ends of the rollback or,,projections tea and I92) beyondrthe edges defining the central slot in sleeve 3. Thus. the central slot is kept clear to permit entry of the retractor element I3. As the retractor element i 8 is projected into the slot, latch bolt i4 is depressed with the thumb or finger and the respective spindles [i and 6 are pushed inwardly toward each other to an extent so that slots Edd and 28b thereof come into registry with the slots 3a and 3b of sleeve 3. Diametrically opposite projections or ears, such as lib and. He, integrally formed on the latch housing H are adapted to. project through the. registering slots 2.817.. and 28b of the respective spindles and the corresponding slots 3a and 3b in the sleeve 3. However, it is necessary to tilt thelatch housing I! sidewise slightly first in one direction and then. in the other so that the ears lit and He will not extend beyond the inner surface of sleeve. 3 and otherwise preventv inner sliding movement of the, spindles. After the spindles. have been slid inwardly sufiiciently to permit registry of the spindle slots 28a and 28band the corresponding slots 3a and 3b a manner so that disassembly or tampering is not readily possible. It will be apparent that screws or small pieces are absent in the assembly and that three main parts; namely, the two knobs and spindles and the latch housing are very quickly interlocked and easily mounted on the door.

Thus it will be seen that I have provided an eilicient, relatively simple and inexpensive door lock assembly comprising essentially three parts which are easily and quickly fitted together and interlocked in a manner so as to provide a substantially tamperprocf lock, and wherein a dogging mechanism may be provided in the inner knob to selectively lock the outer knob merely by depressing a pushbutton on the inner knob to effect entry of a dog into a, slotted portion of the tubular spindle of the outer knob to restrain it against rotation. Also, I have provided a lock construction devoid of screws or small parts which are easily lost or require frequent replacement, and which look assembly may be made of sheet steel parts by means of dies, therefore providing a, very strong construction and having relatively long life.

While I have illustrated and described a certain specific embodiment of my invention, it will be understood that this is by way of illustration only, and that various changes and modifications may be made within the contemplation of my invention and within the scope of the following claims.

I claim:

1. In a lock mechanism, a hollow cylindrical tube adapted to be mounted transversely through a door, hollow cylindrical sleeves mounted within the ends of said tube and which are independently rotatable from opposite sides of the door, a knob rigidly secured to the outer end of each of said sleeves, a bolt adapted to be slidably mounted within the edge of the door, bolt actuating means connected to the bolt in a manner so as to retract it when either knob is turned, a locking member slidably mounted within said sleeves and including a shoulder portion which is engageable with a slot formed in the sleeve connected to the outer door knob so as to lock said sleeve against rotation, asubstantially U-shaped element carried by said hollow cylindrical tube for receiving and guiding a portion of said locking member,

said outer door knob having enclosed therein a cylinder lock which is rotatable with the outer door knob sleeve, a camming element connected to the inner end face of said cylinder lock and having a wedge-shaped end portion, a slidable element slidably mounted within said outside door knob sleeve and having a complementary cam end portion adapted to fit against the wedgeshaped portion of said camming element, said slidable element including a key and slot connection with the surrounding outer door knob sleeve so as to restrain it against rotational movement within the sleeve, said locking member having an end piece against which said last slidable element is adapted to abut as the result of camming action of said camming and slidable elements caused by turning of the cylinder lock with a key so as to remove said shoulder portion from the slot in said outside door spindle and allow free rotational movement of the spindle.

2. Apparatus recited in claim 1' wherein said locking member has secured on opposite faces thereof a pair of spring elements, the ends of said spring elements being slidably engageable with the outside surface portions of said U- shaped support element so as to frictionally hold said locking member in the locking position.

3. A locking mechanism as recited in claim 1 wherein said camming element is in the form of a male and female member rigidly secured together so that the camming element rotates in unison with said locking cylinder.

CHARLES L. HEIZMANN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,482,974 Daele Feb. 5, 1924 1,755,434 Ellingson Apr. 22, 1930 1,759,375 Schlage May 20, 1930 1,796,727 S-chlage Mar. 17, 1931 1,876,079 Schlage Sept. 6, 1932 1,876,885 Ellingson Sept. 13, 1932 1,991,031 Schlage Feb. 12, 1935 2,076,125 Grimsrud Apr. 6, 1937 2,299,180 Schlage Oct. 20, 1942 

